ML19317G818

Forwards Request for Addl Info for Review of Eccs. Re-evaluation Required within 30 Days

ML19317G818
Person / Time
Site:	Rancho Seco
Issue date:	09/15/1975
From:	Reid R Office of Nuclear Reactor Regulation
To:	Davis E SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
NUDOCS 8004010646
Download: ML19317G818 (4)

Text

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TJCarter Docket No. 50-312 OELD

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Sacramento Municipal Utility District VRooney ATTil: Mr. E. K. Davis, General Manager RIngr.na 6201 S Street SVarga P. O. Box 15830 DEisenhut Sacramento, California 95813 Abernathy ACRS (16)

Gentlemen:

We are reviewing your emergency core cooling system reevaluation

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dated July 8,1975 for Rancho Seco Unit 1 and have concluded that the additional information requested in the enclosure is necessary to continue cur review.

It is requested that you provide this information within 30 days of receipt of this letter.

Sincerely,

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l Robert W. Raid, Chief Operating P.eactors Branch #4 Division of Reactor Licensing

Enclosure:

Request for Additional Information cc:

See next page

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I 3acramento :funicipal Utility District cc: David S. Kaplan, Secretary and General Counsel 6201 S Street

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Sacramento, California 95813 Business and !!unicipal Department Sacramento City-County Library 828 I Street Sacramento, California 95814 4

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M ST FOR ADDITIO'IAL IUFOPP.AT RANClio NECO Nt*Cf. EAR GE';ERATIS~, STATIdN.~ INIT 1 S%

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DOCKET 30. 50-312

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==A The ECCS analysis for your plant is referenced to BAW-10103.

Provide 55.5 justification for the following input paradeters used in BAW-10103 By

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comparison with the appropriate values for yo'ur plant.

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Het Trec containment Volu=e - Justification should include the total Ese gross in,ternal containment volume and the internal structures end equip-

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cent cnd their volu=es which are subtracted to obtain the not free

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contain=cnt volucc.

A' discussion of the uncertaintics should be provided.

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passive !! cat Sinks - 5'rovide the actual passive heat sink structures for el==f your plant.

Discuss the =cthod of deter::ining the passive containment ss heat sinks.

Identify each heat _ sink by category (i.e., cable tray, J==

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equipment supports., floor grating, cranc vall, etc.)'and provide surface area, thickness, natcrials of construction, thcrnal conductivity and Z.._

volumetric heat capacity, by compenent category used in the contain cat transient analysis code.

3.

Startinn TES of centainnent Ceolinc Svntc.(r) - Discuss the factors that show that the start tinc(s) assu=cd in the containment response analysis represent the car'.icst possible initiatio:1 of systen(s) operation.

4.

Containment Initial Conditienn J Cc=parc the in'itial values of temperature, pressure and relative hunidity '.n the containment with the range of values that vill be per=itted during plant operr. tion.

5.

Centoinnent Sorav 1:c er Tem reture - Show that the value of containment epray water tc=peraturc used in the contain-cnt response analynis is the lower bound temperature censistent with plant operating conditions and

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that the spray flow rate used is suitably conservative.

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Fan-Cooler Heat Removal Rate - Compare the maximum fan-cooler heat

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Show

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that minimum operational values of service water te=perature hav'e been

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If any of.the above parameters are less conservative' for your picnt N

than used in the generic evaluation of BAW-10103, provide the sensitivity

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of these parancters to the overa11'contain=cnt pressure response.

cvaluation should dc=onstrate the overall conservatism of your contain=cnt

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parnneters to those used in BA*a'-10103.

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